California Multifamily Split HPWH Market Study

This project aims to support utility program administrators in expanding electrification efforts by integrating split-system HPWHs into existing programs. Primary research included outreach to market-rate and low-income multifamily program stakeholders and manufacturers with existing split-system HPWH models and those in development. The project will advance decarbonization goals by identifying market barriers and opportunities, particularly in multifamily buildings with constrained indoor installation spaces. Additionally, mapping the development landscape of split-system HPWH technologies will help utilities and the TECH initiative target marketing strategies and incentive programs to support market development. Although field evaluation and performance data for the new split-system HPWHs are limited, this report provides modeled, representative estimates of energy usage and savings over conventional gas, electric, and unitary HPWHs based on California’s climate and most common building designs.